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8a764482 YS |
1 | /* |
2 | * H8/300H interrupt controller driver | |
3 | * | |
4 | * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp> | |
5 | */ | |
6 | ||
7 | #include <linux/init.h> | |
8 | #include <linux/irq.h> | |
9 | #include <linux/irqchip.h> | |
10 | #include <linux/of_address.h> | |
11 | #include <linux/of_irq.h> | |
12 | #include <asm/io.h> | |
13 | ||
14 | #include "irqchip.h" | |
15 | ||
16 | static const char ipr_bit[] = { | |
17 | 7, 6, 5, 5, | |
18 | 4, 4, 4, 4, 3, 3, 3, 3, | |
19 | 2, 2, 2, 2, 1, 1, 1, 1, | |
20 | 0, 0, 0, 0, 15, 15, 15, 15, | |
21 | 14, 14, 14, 14, 13, 13, 13, 13, | |
22 | -1, -1, -1, -1, 11, 11, 11, 11, | |
23 | 10, 10, 10, 10, 9, 9, 9, 9, | |
24 | }; | |
25 | ||
26 | static void *intc_baseaddr; | |
27 | ||
28 | #define IPR ((unsigned long)intc_baseaddr + 6) | |
29 | ||
30 | static void h8300h_disable_irq(struct irq_data *data) | |
31 | { | |
32 | int bit; | |
33 | int irq = data->irq - 12; | |
34 | ||
35 | bit = ipr_bit[irq]; | |
36 | if (bit >= 0) { | |
37 | if (bit < 8) | |
38 | ctrl_bclr(bit & 7, IPR); | |
39 | else | |
40 | ctrl_bclr(bit & 7, (IPR+1)); | |
41 | } | |
42 | } | |
43 | ||
44 | static void h8300h_enable_irq(struct irq_data *data) | |
45 | { | |
46 | int bit; | |
47 | int irq = data->irq - 12; | |
48 | ||
49 | bit = ipr_bit[irq]; | |
50 | if (bit >= 0) { | |
51 | if (bit < 8) | |
52 | ctrl_bset(bit & 7, IPR); | |
53 | else | |
54 | ctrl_bset(bit & 7, (IPR+1)); | |
55 | } | |
56 | } | |
57 | ||
58 | struct irq_chip h8300h_irq_chip = { | |
59 | .name = "H8/300H-INTC", | |
60 | .irq_enable = h8300h_enable_irq, | |
61 | .irq_disable = h8300h_disable_irq, | |
62 | }; | |
63 | ||
64 | static int irq_map(struct irq_domain *h, unsigned int virq, | |
65 | irq_hw_number_t hw_irq_num) | |
66 | { | |
67 | irq_set_chip_and_handler(virq, &h8300h_irq_chip, handle_simple_irq); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static struct irq_domain_ops irq_ops = { | |
73 | .map = irq_map, | |
74 | .xlate = irq_domain_xlate_onecell, | |
75 | }; | |
76 | ||
77 | static int __init h8300h_intc_of_init(struct device_node *intc, | |
78 | struct device_node *parent) | |
79 | { | |
80 | struct irq_domain *domain; | |
81 | ||
82 | intc_baseaddr = of_iomap(intc, 0); | |
83 | BUG_ON(!intc_baseaddr); | |
84 | ||
85 | /* All interrupt priority low */ | |
86 | ctrl_outb(0x00, IPR + 0); | |
87 | ctrl_outb(0x00, IPR + 1); | |
88 | ||
89 | domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL); | |
90 | BUG_ON(!domain); | |
91 | irq_set_default_host(domain); | |
92 | return 0; | |
93 | } | |
94 | ||
95 | IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init); |